Annals of the Transvaal Museum. 
119 
for this difference I have made allowance and give in brackets what I take 
to be the correct measurements : — 
Head and body ... 
Type S ad. 
125 (118) 
175 (182) 
& ad. 
130 (123) 
S ad. (younger). 
130 (124) 
Tail ... 
170 (177) 
160 (166) 
Hind foot 
27 
27 
27 
Skull, greatest length ... 
33-2 
33 
31-8 
Basilar length 
25 
24-8 
24 
Zygomatic width 
15-5 
15-2 
15-2 
Molar series 
5*2 
5 
5 
Diastema ... ... 
8 
8 ' 
8 
Bullae 
5 
5-1 
4-9 
Inter orbital constriction.. 
4-7 
4-7 
4-6 
Width Brain case 
14 
14 
13-5 
Nasals 
13*3x3-6 
13-3x3-6 
13-5x3-4 
Colour : the whole of the upper surface of the head and body is 
clothed with long, fairly soft hair, measuring about 10 mm. in length, 
with which, especially on the back, are intermingled longer bristles 
measuring about 15 mm. ; the general dorsal appearance is a mingled 
tawny-buff and black, the individual hairs being dark grey at the base, 
then tawny-buff and finally glossy blue-black at the tips. On the flanks 
the black hairs disappear, producing a more uniform huffish. The cheeks 
are more buffy than the forehead, and show only a sprinkling of blackish 
tipped hairs. The ears are dark coloured, sparingly covered with short 
huffish coloured hair. The legs are coloured like the flanks, and the feet 
pure white. The under surface is white, with a tinge of huffish in the 
type, with the base of the hair grey. The tail is huffish below, brown 
above, clothed with a fair sprinkling of correspondingly coloured hairs 
which become more numerous towards and at the tip. 
The type is in the Albany Museum, and the other two specimens 
have been kindly presented to the Transvaal Museum. 
Mus namaquensis monticularis Jmsn. 
1 <£, Waterkloof, Pretoria. 
1 1 5, Warmbath, Carolina. 
1 <^, Theespruit, Carolina. 
2 SS> Worcester Mine, Barberton. 
Mus namaquensis auricomys De Wint. 
1 old $, with young one found clinging to it, Moorddrift, Waterberg. 
The number of mammae is similar to that of M. chrysoplvilus , the 
pectoral pair being rudimentary. 
Mus Moggi Rbts. 
3 2$, 1 S-, Zoutpan, Pretoria. 
In the original description the hind foot and ear are given as 18 and 
20 mm. respectively; but with this new material, I think that a mistake 
was made in recording the measurements originally, and that the 
figures should be reversed. The species seem to be most closely allied to 
Mus damarensis , from which it differs in having smaller teeth. The 
following figures will give a better idea of the proportions of this rat than 
